Furnace roof



Nov. '17, 1953 F. HDNIG 2,659,327 FURNACE ROOF Filed July 23, 1947 2 Sheets-Sheet l FIG. I

INVENTOR FRITZ HOW/6 ATTO R N EY F. HONIG FURNAC- Nov. 17, 1953 2 Sheets-Sheet 2 Filed July 25, 1947 INVENIQR FRITZ HON/6 AT ORNEY Patented Nov. 17, 1953 FURNACE ROOF Fritz Hiinig, Vienna, Austria,

assignor to Veitscher Magnesitwerke-Aktiengesellschaft, Vienna, Austria, a firm Application July 23, 1947, Serial No. 763,017

Section 1, Public Law 690, August 8, 1946 Patent expires August 23, 1960 6 Claims.

The invention relates to furnace roofs and more particularly to roofs of furnaces of the open-hearth type built up of bricks of relatively high specific weight-such as bricks made of chrome magnesite-which are not apt to be cemented together fast but have properties which are excellent regarding refractoriness and small wear and tear and which result therefore in increase of durability of the roof.

Some types of roof built up of bricks of such kind are known. It is the principal object of my invention to attain a greater strength of the furnace roof than is attainable with constructions of known types by providing a close and fast connection between said bricks and iron girders bent in conformity with the arch of the roof and capable of being deformed during the rise of the roof under the influence of heat, whereby the roof may be built up wholly or partly of such armored rows of bricks forming the ribs or stringers of the roof. This temporary deformation or yielding of the girders is attained by an appropriate dimensioning of them so that, on the one hand, they form a rigid back for side by side lying bricks of a row thus holding them in their proper position in the arch but are, on the other hand, not stiff enough to resist the thrust of the rising row of bricks as a whole.

Another object of my invention resides in the particular construction of a furnace roof which is to be built of bricks of relatively high specific weight, by interposing intermediate rows 'of bricks between said supporting ribs and by connecting in a peculiar way the arched girders with the bricks supporting them.

A further object of my invention relates to the mode of suspension of the roof by suspending the arched iron girders on rigid beams whereby the weight of the roof is carried partly by said beams. There are known, of course, various types of suspended roofs of which the ribs-each consisting of a row of supporting bricks-are suspended in different ways by means of various construction elements. In comparison with these types a roof built up according to the invention is extremely simple and inexpensive, and is distinguished by oiiering a possibility of keeping the yielding of the roof during its rise under control. According to the invention a roof of such kind maybe built up wholly or partly of ribs each of which consists of an arched row of bricks and of an arched iron girder connected with the row of bricks and is capable of temporary deformation during the ris of the roof.

Otherfeatures of. this invention will appear as the following description thereof proceeds.

The drawing illustrates two embodiments of roof constructions according to the invention.

Fig. 1 is a transverse sectional view of a suspended roof;

Figs. 2 and 3 illustrate by way of example two embodiments of roof suspensions in a cross-section on a plane taken at right angles to the plane of Fig. 1;

Fig. 4 is a detail perspective view (partly in section) showing a means of suspension of individual bricks;

Fig. 5 is a fragmentary view similar to that of Fig. 1 but showing a modified form of an abutment for a rib.

Referring more particularly to the embodiment of my invention as shown in Figs. 1 and 2, the roof is built up of suspended bricks I forming the supporting ribs and of intermediate rows or areas of bricks 2. The suspended bricks l are springs by any means. Th drawing shows schematically a spring device I4 for the abutment I2 of a rib supporting an arched girder ID (for instance a T-girder). The girders l0 may be suspended adjustably on rigid beams 3 of the iron structure 6 of the furnace. Figs. 2 and 3 show two embodiments of this suspension which may be performed by means of screwed tie-rods 1, as shown in Fig. 2, or by means of wire loops 7a, as shown in Fig. 3, whereby a few suspension members of this sort may be suficient. ously the suspended bricks may be connected with the girder supported by them 9 which may be formed with particular advantage as to simplicity and low costs out of a single continuous length of wire for all bricks of a rib of the roof these bricks and their arched girder form a shaped unit.

in arrangements of known types in which the bricks of the roof are spaced apart fromthe for connecting the bricks with the arched girder l lying close to them, is much more simple and inexpensive. In building up such a roof the arched iron girders are laid on after completion of the brick roof on the arch centering and subsequently connected with the bricks by the tightening of the wire loop.

In place of the arched iron girders i0 pressure straps 4 may be used (see Fig. 5) which are connected to the iron structure of the furnace by any known spring device. In the embodiment as shown the strap 4 is put under tension by a spring 5 and thereby pressed on th roof whereby by virtue of the fast connection of the bricks with their adjacent strap the proper position of neighboring bricks in the roof remains unaltered. Owing to the springy abutment, however, the pressure straps do not prevent the yielding of the roof as a whole.

As the loops lie close to the arched girders ill or to the pressure straps 4, respectively, without projections, hole-guides or the like, a longitudinal displacement of th girders or of the bricks can take place in conformity with the different expansion of both caused by heat.

Having now fully disclosed my invention, what I claim as new and desire to secure by a patent of the United States of America is:

1. A furnace roof comprising an iron frame, a

a group of bricks brick vault including a plurality of rows of bricks,

each of said rows forming an arched rib, a plurality of arched reinforcing members respectively overlying said ribs and making contact with the bricks thereof over substantially the full length of each rib, supporting means individually securing each brick of a rib to the adjacent reinforcin member in such manner as substantially to prevent relative radial movement between said bricks and said member while permitting some relative longitudinal adjustment thereof, each of said reinforcing members being sufliciently deformable to enable said vault to expand and rise under the influence of heat, abutment means bearing endwise on each of said ribs. guide means on said frame enabling horizontal movement of said abutment means toward said ribs, spring means urging said abutment means into contact with said ribs, and suspension means supportin said reinforcing members from said frame.

2. A furnace roof according to claim 1, further comprising a plurality of intermediate brick sections alternating with and supported by said rows of bricks.

3. A furnace roof according to claim 1 wherein each of said reinforcing members comprises an arched girder having a bottom flange, said flange bearing upon the bricks of the corresponding rib and being maintained in direct contact therewith by said supporting means.

4. A furnace roof comprisin an iron frame, a brick vault including a plurality of rows of bricks, each of said rows forming an arched rib, a plurality of arched reinforcing members respectively overlying said ribs, supporting means individually securing each brick of a rib to the ad.- jacent reinforcing member in such manner as substantially to prevent relative radial movement between said bricks and said member, each of said reinforcing members being sufliciently deformable to enable said vault to expand and to rise under the influence of heat, abutment means bearing endwise on each of said ribs, guide means on said frame enabling horizontal movement of said abutment means toward said ribs, spring means urging said abutment means into contact with said ribs, and suspension means supporting said reinforcing members from said frame, each of said reinforcing members comprising a curved pressure strap and having an extremity engaged by said spring means, thereby exerting a downward pressure upon the associated rib.

5. A furnace roof comprising a brick vault including a plurality of rows of bricks, each of said rows forming an arched rib, a frame supporting said vault, a plurality of arched reinforcing members respectively overlying said ribs, and supporting means individually securing each brick of a rib to the adjacent reinforcing member in such manner as substantially to prevent relative radial movement between said bricks and said member, each of said reinforcing members being sufficiently deformable to enable said vault to expand and to rise under the influence of heat, said bricks being provided with projections, said supporting means including supple wire means looped around a reinforcing member and underslinging the projections of the bricks of the associated rib while lying snugly against said bricks over a substantial portion of each projection, said wire means maintaining said bricks and said member in close contact with one another.

6. A furnace roof comprising a brick vault including a plurality of rows of bricks, each of said rows forming an arched rib, a frame supporting said vault, a plurality of arched reinforcing members respectively overlying said ribs, abutment means bearing endwise on each of said ribs, guide means on said frame enabling horizontal movement of said abutment means toward said ribs, spring means urging said abutment means into contact with said ribs, and supporting means individually securing each brick of a rib to the adjacent reinforcing member in such manner as substantially to prevent relative radial movement between said bricks and said member, each of said reinforcing members being sufficiently deformable to enable said vault to expand and to rise under the influence of heat. said bricks being provided with projections, said supporting means including wire means looped around a respective reinforcin member and engaging said projections in such manner as to suspend said bricks from th reinforcing member while maintaining said bricks and said member in close contact with each other, said wire means including a continuous length of wire engaging a plurality of bricks having the said projections thereof facing in the same direction.

Farm Home.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 403,152 sleicher May 14, 1889 1,214,066 Poull Jan. 30, 191! 1,266,745 Wundrack May 21, 1918 1,341,977 Gates June 1, 1920 1,440,446 Cotton Jan. 2, 1923 1,512,004 Stevens Oct. 14, 1924 1,582,275 Kellner Apr. 27, 1926 1,601,485 Abbott Sept. 28, 1928 FOREIGN PATENTS Number Country Date 313,175 Great Britain June 19, 1930 846,728 France June 12, 1939 

